/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * <p>Demonstrates text-to-speech (TTS). Please note the following steps:</p>
 *
 * <ol>
 * <li>Construct the TextToSpeech object.</li>
 * <li>Handle initialization callback in the onInit method.
 * The activity implements TextToSpeech.OnInitListener for this purpose.</li>
 * <li>Call TextToSpeech.speak to synthesize speech.</li>
 * <li>Shutdown TextToSpeech in onDestroy.</li>
 * </ol>
 *
 * <p>Documentation:
 * http://developer.android.com/reference/android/speech/tts/package-summary.html
 * </p>
 * <ul>
 */

package com.tools.developer.speech;

import java.util.Locale;
import java.util.Random;

import android.app.Activity;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.speech.tts.TextToSpeech.OnInitListener;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

import com.tools.developer.R;

public class SpeechActivity extends Activity implements OnInitListener,
		OnItemSelectedListener {

	private static final String TAG = "TextToSpeechDemo";

	private TextToSpeech mTts;
	private Button mAgainButton;
	private Locale mLoc = Locale.US;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_speech);

		// Initialize text-to-speech. This is an asynchronous operation.
		// The OnInitListener (second argument) is called after initialization
		// completes.
		mTts = new TextToSpeech(this, this // TextToSpeech.OnInitListener
		);

		// The button is disabled in the layout.
		// It will be enabled upon initialization of the TTS engine.
		mAgainButton = (Button) findViewById(R.id.again_button);

		mAgainButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				sayHello();
			}
		});

		Spinner spinner = (Spinner) findViewById(R.id.speech_select_language);

		spinner.setOnItemSelectedListener(this);
	}

	@Override
	public void onDestroy() {
		// Don't forget to shutdown!
		if (mTts != null) {
			mTts.stop();
			mTts.shutdown();
		}

		super.onDestroy();
	}

	public void onInit(int status) {
		// status can be either TextToSpeech.SUCCESS or TextToSpeech.ERROR.
		if (status == TextToSpeech.SUCCESS) {
			// Set preferred language to US english.
			// Note that a language may not be available, and the result will
			// indicate this.
			int result = mTts.setLanguage(mLoc);
			// Try this someday for some interesting results.
			// int result mTts.setLanguage(Locale.FRANCE);
			if (result == TextToSpeech.LANG_MISSING_DATA
					|| result == TextToSpeech.LANG_NOT_SUPPORTED) {
				// Lanuage data is missing or the language is not supported.
				Toast.makeText(this.getApplicationContext(),
						"Language is not available.", Toast.LENGTH_LONG).show();
			} else {
				// Check the documentation for other possible result codes.
				// For example, the language may be available for the locale,
				// but not for the specified country and variant.

				// The TTS engine has been successfully initialized.
				// Allow the user to press the button for the app to speak
				// again.
				mAgainButton.setEnabled(true);
				// Greet the user.
				sayHello();
			}
		} else {
			// Initialization failed.
			Log.e(TAG, "Could not initialize TextToSpeech.");
		}
	}

	private static final Random RANDOM = new Random();
	private static final String[] HELLOS = { "Hello", "Salutations",
			"Greetings", "Howdy", "What's crack-a-lackin?",
			"That explains the stench!" };

	private void sayHello() {
		// Select a random hello.
		int helloLength = HELLOS.length;
		String hello = HELLOS[RANDOM.nextInt(helloLength)];
		mTts.speak(hello, TextToSpeech.QUEUE_FLUSH, // Drop all pending entries
													// in the playback queue.
				null);
	}

	@Override
	public void onItemSelected(AdapterView<?> parent, View view, int position,
			long id) {
		switch (position) {
		case 0:
			mLoc = Locale.CHINESE;
			break;
		case 1:
			mLoc = Locale.SIMPLIFIED_CHINESE;
			break;

		case 2:
			mLoc = Locale.TAIWAN;
			break;
		case 3:
			mLoc = Locale.US;
			break;
		case 4:
			mLoc = Locale.JAPAN;
			break;
		default:
			break;
		}
		mTts = new TextToSpeech(this, this);
	}

	@Override
	public void onNothingSelected(AdapterView<?> parent) {
		// TODO Auto-generated method stub

	}

}
